Siemens SIPROCESS GA700 Kompaktbetriebsanleitung Seite 159

Sample gas preparation
The sample gas must be conditioned to prevent contamination of the parts through which it
flows. We recommend the following minimum configuration:
● Gas sampling device with filter
● Sample gas cooler
● Analyzer filter, medium pore size <10 µm
Depending on the characteristics of the sample gas it may be necessary to provide
additional equipment, for example, an external gas suction pump, washing bottle or pressure
reducer.
In the case of toxic, aggressive and/or combustible gases ensure that the components are
suitable for use. They must be approved for the respective application.
Sample gases
When measuring toxic or corrosive gases, the gas path may start to leak and sample gas
can accumulate in the device. This means devices used in hazardous areas must be purged
with air or inert gas. The gas discharged by purging must be routed via an exhaust gas line
for environmentally-friendly disposal.
The following applies for devices which are approved for use in explosive dust atmospheres
(type of protection Ex t)
Do not introduce gases which have toxic, corrosive or flammable components in potentially
dangerous concentrations.
The following applies for devices which are approved for operation in the type of protection
"Increased safety" (Ex ec):
Do not introduce any combustible to occasionally ignitable gas compositions.
Common exhaust gas line
When the sample gas is removed into a collective exhaust line, observe the following points:
● The exhaust gas line must be free of "rapid" pressure fluctuations. If such pressure
fluctuations are present, implement appropriate remedial measures:
– Install a special exhaust line.
– Alternatively: Install a damping vessel (> 1 l) between the device and the exhaust line.
● Water can condensate in the exhaust line.
– Therefore, install the exhaust line as vertical as possible.
Devices in explosion-proof design
Compact Operating Instructions, 11/2019, A5E35134047-04
Connecting
5.1 Gas connections
37